---
id: CVE-2025-66043
title: >-
  Several stack-based buffer overflow vulnerabilities exists in the MFER parsing
  functionality of The Biosig Project libbiosig 3.9.1
summary: >-
  Several stack-based buffer overflow vulnerabilities exists in the MFER parsing
  functionality of The Biosig Project libbiosig 3.9.1. A specially crafted MFER
  file can lead to arbitrary code execution. An attacker can provide a malicious
  f…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
  - CWE-787
vendor: libbiosig_project
product: libbiosig
affected:
  - libbiosig < 3.9.2
patched:
  - libbiosig 3.9.2
published: '2025-12-11'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:10:01.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66043'
references:
  - url: 'https://talosintelligence.com/vulnerability_reports/TALOS-2025-2296'
    label: talos-cna@cisco.com
  - url: 'https://talosintelligence.com/vulnerability_reports/TALOS-2025-2296'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00713
epssPercentile: 0.52083
ingestedAt: '2026-10-07T20:46:46.854Z'
---

## Overview

Several stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1. A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger these vulnerabilities.When Tag is 3

## Affected

- `libbiosig < 3.9.2`

## Remediation

Upgrade past the affected range:

- `libbiosig 3.9.2`